120%AC

#include<cstdio>
int main(){
    int n;
    scanf("%d",&n);
    printf(n/1000==n%10&&(n%1000-n%100)/100==(n%100-n%10)/10?"Yes":"No");
    /*
    让n=2332
    n/1000==2
    n/100==23
    n/10==233
    n%10==2
    n%100==32
    n%1000==332
    */
}